UPD6P8 NEC [NEC], UPD6P8 Datasheet - Page 64

• Manufacturer Part Number: UPD6P8
• Description: MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION
• Manufacturer: NEC [NEC]

13.WRITING AND VERIFICATION OF ONE-TIME PROM (PROGRAM MEMORY) ( µ PD6P8A, 6P8B)
instruction and 5-bit data via serial communication. The assembler output has an 8-bit configuration, so mask the
higher three bits and program the lower five bits.
13.1 Initialization
to V
64
2
3
4
6
7
8
9
10
The program memory built into the µ PD6P8A and 6P8B is a one-time PROM of 2026 × 10 bits.
Writing or verification of this one-time PROM is performed using the pins listed in Table 13-1, and a 5-bit
When a high voltage (10.5 V) is supplied to V
In the programming mode, pins not used for programming are pulled down internally, so leave them open.
S1/LED is set to output mode (H) when 3 V is supplied to V
Serial communication is performed in 5-bit units, starting from the MSB.
Pin No.
PP
, the input mode is set after about 1 ms.
SO
SCLK
SI
V
X
X
GND
V
DD
OUT
IN
PP
Symbol
Table 13-1. Pins Used During Program Memory Writing/Verification
Serial data output during program memory verification
Clock input during program memory writing or verification
Serial data input during program memory writing
Power supply
Supply +3 V to this pin during program memory writing or verification.
Clock required during program memory writing or verification. Connect a
4 MHz ceramic resonator to these pins.
GND
Voltage application pin during program memory writing or verification.
Apply +10.5 V to this pin.
Data Sheet U17848EJ3V0DS
PP
, the programming mode is set after about 1 ms.
Function
DD
and V
PP
. When a high voltage (10.5 V) is supplied
µ PD6P8, 6P8A, 6P8B
Output
Input
Input
Input
I/O
–
–
–
–